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...by Uwe Ligges. Now I have a new question. How to convert a PPM file to BMP file in R? I know I can do this in photoshop or by some other softwares, but I think if I Can do this in R, that would be great! Would anyone please give me any hints? just hints, I will dig it out! Thanks a lot! Yingqi ******************** Yingqi ZHANG Beijing P.O. Box 643, China 100044 Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) Chinese Academy of Sciences Tel: +86-10-88369378 Fax: +86-10-68337001 Email: arvicolid at gmail.com

...l by pixel into the file? Any help or hint? What I want to do is to create a 512*512 bmp file with certain dots being red and others black. I have all the pixel coordinates for the red dots, but I don't know how to draw the color on the device. Please help me! Sincerely yours, Yingqi ******************** Yingqi ZHANG Beijing P.O. Box 643, China 100044 Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) Chinese Academy of Sciences Tel: +86-10-88369378 Fax: +86-10-68337001 Email: arvicolid at gmail.com